EU Sovereignty Score
Self-hosted / open sourceDesktop OSHeadquarters: DE

ReactOS: sovereignty score and 8 European alternatives

ReactOS is a free and open-source operating system that aims to be binary-compatible with programs and device drivers written for Windows, from Windows Server 2003 onwards. It runs on i586 and amd64 PCs and is written mainly in C. The project describes its mission as running Windows apps and drivers in an open-source environment. ReactOS is downloaded and installed on your own hardware or in a virtual machine. Wikipedia still describes it as feature-incomplete alpha software, recommended mainly for evaluation and testing, although many Windows applications run on it.

The code is released under GPL-2.0-or-later, with some parts under the LGPL and BSD licences. It is developed by the ReactOS Team and contributors. The website is operated by ReactOS Deutschland e.V., a German registered charitable association in Rheda-Wiedenbrück. According to the project, the operating system does not collect personal data. The website is hosted by an external provider under a data processing agreement and uses Google reCAPTCHA. For European organisations it is mainly an open alternative that you can inspect entirely yourself.

See the 8 European alternatives ↓Assess your stack with ReactOS pre-selected
Sovereignty score
94 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-2100
    Headquartered in the EU: European law applies
  • Data residency SOV-3100
    EU-only hosting
  • Cryptographic key sovereignty SOV-390
    Self-hostable: encryption keys under your own control
  • Freedom from lock-in SOV-680
    Open source: low switching costs
  • Source & runtime sovereignty SOV-4 · SOV-6100
    Source code auditable, forkable and self-hostable

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked July 2, 2026
HeadquartersDE (EU)Verified by hand
Sovereignty modelOpen-source, distributedVerified by hand
Data hostingEUVerified by hand
Open-sourceYesVerified by hand
GDPR-compliantYesVendor-stated
Compliance documents3 published, see belowVendor-stated
Hosting signalHETZNER-AS - Hetzner Online GmbH, DE (DE)Technically measured
CategoryDesktop OS
TypeProduct
Websitereactos.org ↗

The hosting signal shows the network that serves the vendor's website, often a CDN, and not necessarily where the service or your data is hosted. How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to ReactOS

The European alternatives to ReactOS come from our knowledge base of over 6,200 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

22 European Desktop OS vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with ReactOS

ReactOS is headquartered in DE and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data.

Data is hosted exclusively in the EU, so ReactOS scores best on data residency.

ReactOS is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.

What this means for your organisation depends on your whole stack and context. The free assessment weighs ReactOS together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to ReactOS?

It depends on your use case. Strong EU alternatives to ReactOS include Alpine Linux, Devuan and /e/OS. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to ReactOS?

Yes. Open-source EU alternatives to ReactOS include Alpine Linux, Devuan, /e/OS, EndeavourOS, KDE neon, Linux Mint, Mageia and Manjaro. These keep your data fully under your own control and let you self-host if you want to.

Is ReactOS GDPR-compliant and where is the data hosted?

ReactOS is headquartered in DE (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes ReactOS an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on July 2, 2026.

Sources

This record was checked via the vendor's website and legal notice during the full audit of June and July 2026. Source links have been recorded per record since 20 September 2026.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

Data Processing Agreement (DPA)
reactos.org/legal
Security page / trust center
policies.google.com/privacy?hl=de
EU hosting documented
policies.google.com/privacy?hl=de

Provenance of the links above:Vendor-stated

Links checked on September 21, 2026.

Cyber Resilience Act

Public signals that relate to the EU Cyber Resilience Act. They do not count towards the score. A missing line means "not found publicly".

We found none of these signals on the vendor's own site when we checked.

For products in scope of the CRA, CE marking is required from 11 December 2027; this cannot be checked yet.

Checked on October 9, 2026. What is the Cyber Resilience Act?

Digital sovereignty in Desktop OS

Desktop OS: Desktop operating system — daily work platform. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

Also in this category

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8 European alternatives to ReactOS — GDPR-compliant & EU-hosted · EU Sovereignty Score